The unique enzymatic function of field bean (<Emphasis Type="Italic">Dolichos lablab</Emphasis>) <Emphasis Type="SmallCaps">d</Emphasis>-galactose specific lectin: a polyphenol oxidase |
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Authors: | Santosh R Kanade Devavratha H Rao Ramanath N Hegde Lalitha R Gowda |
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Institution: | (1) Department of Protein Chemistry and Technology, Central Food Technological Research Institute, Council of Scientific and Industrial Research (CSIR), Mysore, 570020, India |
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Abstract: | The polyphenol oxidase (PPO) of field bean (Dolichos lablab) is a tetramer made up of two subunits of mass 29,000 and 31,000 Da. The amino acid sequence of the tryptic peptides showed
approximately 90% sequence identity to the d-galactose specific legume lectins. The haemagglutinating activity of a pure and homogenous preparation of PPO measured using
human erythrocytes was 1261 HAU mg−1 protein and was inhibited by d-galactose. Purification by galactose-sepharose chromatography also indicated that the PPO and haemagglutinating activities
were associated with a single protein. Crude extracts of other legumes did not exhibit PPO activity, yet cross reacted with
anti-PPO antibodies. This dual function protein with PPO and haemagglutinating activity is unique to field bean. The two activities
are independent of each other occurring at different loci on the protein. These observations further evidence and strengthen
the assumption that galactose specific legume lectins have enzymatic function. Both PPO and lectins are proteins that play
a vital role in the defense mechanism of plants. The complementarity of these two simultaneous and independent powerful defense
mechanisms exhibited by a single protein renders it a candidate gene for the development of inbuilt plant protection. |
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Keywords: | Catechol oxidase Haemagglutination Galactose sepharose Legume lectin Dolichos biflorus |
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